A.Cranes are able to pick up and drop loads over a greater spotting area
B.Increased safety because the deck is clear of running and standing rigging
C.Simplicity of operation of the crane by its operator
D.All of the above
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A.It allows for rotation of the hook in the single mode
B.It is required to“twin-up”30-ton pedestal cranes
C.It is used to pick up light loads
D.It is used to rigidly connect two cranes
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
最新試題
Sudden starts or stops of the boom is likely to cause all of the following except（）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited（）.
Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
How should you signal the crane operator to lower the boom and raise the load（）.